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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bdf0ee42dc3ca3aa9891825fc6d7362dd512ecac4fb7e4af882c9adcf1ed3e' 
  AND token = 'tj3MYL1IUdD/GL2Sl/m7Z60WiTnX0TMDKteW5aluu8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}